Characterization and fabrication of wireless flexible physiological monitor sensor

The study reported a novel design and fabrication process of a wireless flexible physiological monitor module, which is based on a polyimide substrate for a printed circuit and uses on a non-woven material to package the module by a hot-press. The module is sufficiently thin and light to paste on human wrists for monitoring body temperature and heart rate. The advantages of the module include the ability to effectively monitor the physiological signals during the postural change or shaking, a flexible antenna for wireless transmission, and a sensor package made the conductor trace line does not crack after repeated bending. Furthermore, to realize a flexible board, the meander concept was used to improve strength; six thin stainless steel sheets on the polyimide form the banded block, which can withstand repeated bending while worn on the human arm. Experimental results show that the thickness of the flexible physiological sensor is about 2 mm, the minimum radius of curvature is about 2.5 cm, and the specification should be 25-45 °C and 50-200 bpm, respectively. More efficient measurement is achieved with miniaturization and ergonomic design for portable physiological monitor use.